Intake low

I'm so worried my LO just turn 1 yesterday. For the past few days her intake of milk and water are lesser to soild in ifc is good.. before that she will drink alot of water whenever we give it to her... milk is from usual 210ml now drop to 180ml sometimes not even finish but there is meal in between I monitor her pee from night 8pm to morning 630am is very little not heavy but she still very active no dehydrated symptoms.. What should I do now? Keep monitor or is just phase of changes? 🥺